Docker_Installation.txt

Installing Docker CE on Ubuntu:

Update Ubuntu Libraries
>sudo apt-get update

#Add HTTPS
#>sudo apt-get install \
#    apt-transport-https \
#    ca-certificates \
#    curl \
#    gnupg-agent \
#    software-properties-common
    
#Add Docker’s official GPG key:
#>curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

#Add Docker APT Repository for Ubuntu:
#>sudo add-apt-repository \
#   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
#   $(lsb_release -cs) \
#   stable"
   
#Update APT package index
#>sudo apt-get update

Install Latest version of Docker CE
>sudo apt-get install docker-ce

Or try this
>sudo apt-get install docker.io

Check if docker service is running
>sudo systemctl status docker

If not running, start it
>sudo systemctl start docker

Check if Docker is installed
>docker version

Add ubuntu user to docker user group
>sudo usermod -aG docker ubuntu

or if running on Vagrant
>sudo usermod -aG docker vagrant

Open a new Terminal (duplicate Putty session)
Check by running Docker hello-world image

>docker run -it hello-world